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Juan Alejandro Lopez Rosales told police he dropped his baby on a Tuesday in June.

That week the baby became fussy, developed a temperature and stopped eating. By that Sunday, the baby was having a hard time breathing.

"I saw my son, he was not moving. I picked him up and I got really scared, so I just grabbed my keys and took him to the hospital," Rosales said in the police interview.

At first, Rosales told police he had no idea what could have happened to his 7-week-old son.

Doctors discovered the baby had a large skull fracture and declared him brain dead.

Despite a lawsuit by the mother, the baby was taken off life support after nearly four weeks.

"How can I hurt my only son? The only child that I have, everything I love. How can I hurt him?" said Rosales.

"Somebody did, and there's only two people that could have done it," a detective told Rosales.

Rosales spent hours telling police he didn't know how the baby fractured his skull, but finally, he told investigators about the fall. He said he was giving the boy a bath when he squirmed and fell in the tub.

"I was laying him in the water. He turned this way, and then I was like this, but he turns this way, he's like (imitating motion of baby), like that," said Rosales.

"Did he hit his head on the side of the tub?" the detective asked.

"Yeah," Rosales answered.

Rosales said he didn't think the baby needed to see a doctor right away. Now, he is facing charges of criminal abuse.

Prosecutors are reviewing the case to decide if he should be charged with murder.

Rosales is due back in court next week. He is being held at Louisville Metro Corrections on a $100,000 bond.